Hands down, the single download with the most comprehensive set of tools for cleaning a PC and making it run faster is CCleaner, which gives your system a thorough scrubbing and makes it like new. For starters, it gets rid of all the unnecessary files that programs, browsers, and Windows itself leave behind; it'll eliminate .tmp files, cache files, file fragments, history lists, and more, including detritus from apps such as the major Web browsers, Microsoft Office, and Adobe Flash Player.

If that's all it did, this program would already be a must-have -- but it can do more, as well. You'll find a very good Registry cleaner for zapping outdated Registry files (see the Registry section below for more on that topic), plus a tool for deleting Internet cookies you don't want while leaving behind the ones you wish to keep. And if you don't want to use the Windows uninstaller, CCleaner has a built-in uninstaller, too. Sound overwhelming? No worries: CCleaner lets you select the tasks it should perform. For example, you can tell it to erase traces that Chrome and Firefox leave behind, but not to clean up after Adobe Flash Player or Windows Media Player.

Just as remarkable, you don't have to pay a pretty penny for this program -- it's donationware. You can pay what it's worth to you, from zero dollars on up.

Another useful freebie is 360Amigo System Speedup Free, which cleans the Registry, removes junk files, and defragments your hard disk. It's not as comprehensive as CCleaner, and it tends to overreport problems, but it's still worth a look.

Sweep Away Gunk

The very first time you start up a new PC, you might expect it to be free of gunk and unnecessary software, such as trialware. Unfortunately, that's not the case. Even on a PC's maiden voyage, you'll typically find it loaded down with "craplets" -- unwanted demos, trialware, and the like that the software makers have paid the PC manufacturer to install. These craplets junk up your hard disk, and can slow down its performance.

What to do? Download and run the free PC Decrapifier. It seeks out and removes dozens of craplets to help make your PC a smooth-running machine. It won't clean out every piece of unneeded software; instead it looks for a list of known craplets, demos, and trialware. Regardless, even if you have an older PC, this tool is worth using, because that unneeded software may still be hiding on your computer.

Tidy Up the Registry (Perhaps)

One cause of many system slowdowns is the Windows Registry, which contains information about all your installed software, your preferences, how Windows should run, and more. Over time, as you install and uninstall software, change your preferences, and so on, the Registry fills with outdated entries, incorrect entries, and entries that conflict with one another. The likely result? Your system slows down and becomes more susceptible to crashing.

Note, however, that the benefits of cleaning the Registry are the focus of much debate. In some cases, Registry edits may help an ailing PC; in others, they may create problems. Before diving in, read "Are Registry Cleaners Worth It?" for some analysis.

If you want to try Registry cleanup, look to Advanced Registry Optimizer 2010, which finds problems and fixes them for you. You can have it do all the cleanup automatically, or tell it which items to clean and which entries to ignore.

The software gives you greater control over Registry cleaning than does CCleaner, but you'll be able to fix only 100 entries with it unless you pay the $30 fee to buy it. If you are confident about making sweeping changes to the Registry, get this program; otherwise, CCleaner will do fine for you.

Be aware, too, that you should always create a Windows system restore point before using Advanced Registry Optimizer 2010--or any Registry cleaner--in case it makes changes that cause your PC problems.

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